/* 先删除默认的内外边距 */
* {
    margin: 0;
    padding: 0;
}
html {
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    font-size: 62.5%;  /* 设置过根节点的文字大小后，所有子节点的文字大小全部相对于根节点计算，html为10px */
  }
  body, input, button, a, textarea, select {
    margin: 0;
    font-family: "Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    font-size: 1.4rem;
    line-height: 1.5;
    color: #333;
  }
  html, body {
    width: 100%;
    height: 100%;
    margin: 0;
  }
  
  a {
    text-decoration: none;
  }
  a:hover, a:focus {
    text-decoration: none;
  }
  a:hover {
    filter: alpha(opacity=90);
    opacity: .9;
  }

  /* 文本对齐 */
  .tc {
    text-align: center;
  }
  
  .tr {
    text-align: right;
  }
  
  .tl {
    text-align: left;
  }

  /* 主体 */
  .content {
    color:#fff;
    background: #000;
    width:100%;
    height:scale(100vw-70px);
  }
  .bg {
    background:url('../img/pageBg.png') no-repeat center center;
    background-size: cover;
  }
  .module-box {
    display:flex; 
    justify-content: space-between; /*两端对齐*/
    margin:5px;
  }
  .center {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    margin: auto;
  }
